US6312195B1 - Method of installing foundation for tension leg platform - Google Patents
Method of installing foundation for tension leg platform Download PDFInfo
- Publication number
- US6312195B1 US6312195B1 US09/441,377 US44137799A US6312195B1 US 6312195 B1 US6312195 B1 US 6312195B1 US 44137799 A US44137799 A US 44137799A US 6312195 B1 US6312195 B1 US 6312195B1
- Authority
- US
- United States
- Prior art keywords
- pile
- template
- piles
- driving
- ocean floor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
Definitions
- This invention relates to a foundation system for tension-leg platforms where tendons are anchored directly to sockets fitted inside the piles thereby doing away with the need to make use of rigid structures known as foundation templates.
- TLPs tension leg platforms
- This template has cylindrically shaped guides into which are driven tubular piles which are fixed to the foundation template either by cementing the annular space between the cylindrically shaped guide and the pile, or by deforming the steel of the pile with the aid of a tool which expands it against the guide, thereby bringing about a mechanical connection between the pile and the guide.
- U.S. Pat. No. 4,620,820 illustrates a foundation system such as the one described above and discloses equipment and an anchoring system for a tension leg platform anchored to the sea bottom by means of an anchoring assembly made up of upper and lower parts.
- the upper part thereof is tied to the bottom ends of the tendons forming the tension legs of the tension leg platform.
- the upper part of the anchoring assembly serves to space out and line up each tendon, keeping them straight when the upper part of the assembly is joined to the lower part which has first of all been fixed to the sea bottom by means of the piles.
- the foundation templates have to withstand cycles of heavy strain and must therefore be designed to withstand the ensuing fatigue which inevitably leads to their being sturdily and heavily built, thereby increasing the anchoring cost. Another critical point is that the joining of piles to the templates is prone to failure.
- this invention provides a tension leg platform foundation system wherein each tendon is directly connected to its pile by means of a socket fitted into the pile, the piles being driven in with the aid of a template which also serves to keep the piles apart from the template for the wells as they are positioned by means of pins that slot into guides fitted into the well-drilling template. After piles have been driven to anchor down one corner of the platform the template is withdrawn, and repositioned, so as to enable the piles for the other tendons to be driven, this procedure is repeated until all the piles have been driven.
- the pile-driving template can also be built so as to serve as a guide for all of the piles thereby doing away with the need to reposition the template after each group of piles; has been driven.
- FIG. 1 is a partial view, in perspective, of an offshore platform anchored by tension legs attached to a foundation template fixed to the sea bottom;
- FIG. 2 is a schematic top plan view of a platform positioned over the well template
- FIG. 3 is a schematic top plan view of a platform positioned over a well template and a pile-driving template
- FIG. 4 is a schematic side view of the foundation system of the invention for a tension leg platform, and includes a schematic front view of the pile-driving template;
- FIG. 5 is a schematic view showing how a tendon fits into a pile.
- FIG. 6 is a schematic top plan view of a platform positioned over the well template and the pile-driving template, which latter serves as a guide for all of the piles.
- FIG. 1 is a perspective view of an offshore platform ( 1 ) held up by columns ( 2 ) arranged about the corners of a supporting structure ( 3 ), which is anchored to a foundation structure ( 4 ) by means of tendons ( 5 ).
- the foundation structure ( 4 ) referred to by those skilled in the art as a template, is fixed to the sea bottom by means of tubular piles (not shown in the drawing).
- this invention provides a foundation system for tension leg platforms as shown in FIGS. 2 to 5 .
- FIGS. 2 and 3 are schematic top plan views of a supporting structure ( 3 ) for a tension leg platform positioned over a well template ( 6 ) fixed to the sea bottom, the well template ( 6 ) having guides ( 7 ) that serve to position the template ( 10 ) as will be described later.
- FIG. 4 shows piles ( 8 ) driven in with the aid of a pile-driving template ( 10 ), which is a tubular structure, and which also serves to keep the groups of piles apart from the production template.
- the pile-driving template ( 10 ) is positioned with the aid of pins ( 11 ) which slot into guides ( 7 ) fitted on the well template ( 6 ).
- the pile-driving template ( 10 ) is a tubular structure whose top part is fitted with pins ( 11 ) that slot into the guides ( 7 ) of the well template ( 6 ) so as to ensure proper positioning of piles ( 8 ) before they are driven into the sea bed through guides ( 13 ) fitted into the front of the pile-driving template ( 10 ).
- FIG. 5 shows a tendon ( 5 ) fitted directly into socket ( 9 ) built into the pile ( 8 ), thus eliminating any need for a foundation template such as is shown at ( 4 ) in FIG. 1 .
- a pile may be used to fix a tendon and also that more than one tendon may be fixed to a pile.
- the pile-driving template ( 10 ) is withdrawn and repositioned so as to enable the piles for the remaining tendons to be driven. This procedure is continued until all of the piles have been put in.
- the template ( 10 ) may also be built so that one template ( 10 ) can serve as a guide for the driving of all of the piles ( 8 ) as a whole without repositioning. Such an alternative is shown in FIG. 6, where a single template ( 16 ) eliminates the need to reposition after every group of piles has been driven. Either of these two kinds of templates may or may not be raised from the sea bottom after all of the piles have been driven.
- piles ( 8 ) be used which have closed conically shaped ends ( 14 ) as disclosed in our AU-B 623085.
- ballast ( 15 ) for the piles ( 8 ) allows for shallower driving and for shorter piles, which means easier and cheaper handling.
- Ballast which is not employed in conventional kinds of foundations, consists of low cost material, preferably hematite.
Abstract
Description
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/441,377 US6312195B1 (en) | 1993-08-31 | 1999-11-17 | Method of installing foundation for tension leg platform |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9303646 | 1993-08-31 | ||
BR9303646A BR9303646A (en) | 1993-08-31 | 1993-08-31 | Foundation system for tilt leg platforms |
US29875394A | 1994-08-31 | 1994-08-31 | |
US08/733,698 US6318933B1 (en) | 1993-08-31 | 1996-10-17 | Foundation system for tension leg platforms |
US09/059,999 US6036404A (en) | 1993-08-31 | 1998-04-15 | Foundation system for tension leg platforms |
US09/441,377 US6312195B1 (en) | 1993-08-31 | 1999-11-17 | Method of installing foundation for tension leg platform |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/059,999 Continuation US6036404A (en) | 1993-08-31 | 1998-04-15 | Foundation system for tension leg platforms |
Publications (1)
Publication Number | Publication Date |
---|---|
US6312195B1 true US6312195B1 (en) | 2001-11-06 |
Family
ID=25664580
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/059,999 Expired - Lifetime US6036404A (en) | 1993-08-31 | 1998-04-15 | Foundation system for tension leg platforms |
US09/272,165 Expired - Lifetime US6142709A (en) | 1993-08-31 | 1999-03-18 | Foundation system for tension leg platforms |
US09/441,377 Expired - Lifetime US6312195B1 (en) | 1993-08-31 | 1999-11-17 | Method of installing foundation for tension leg platform |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/059,999 Expired - Lifetime US6036404A (en) | 1993-08-31 | 1998-04-15 | Foundation system for tension leg platforms |
US09/272,165 Expired - Lifetime US6142709A (en) | 1993-08-31 | 1999-03-18 | Foundation system for tension leg platforms |
Country Status (1)
Country | Link |
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US (3) | US6036404A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6568880B2 (en) | 1993-08-31 | 2003-05-27 | Petroleo Brasileiro S.A. - Petrobras | Foundation system for tension leg platforms |
US20100061810A1 (en) * | 2008-09-09 | 2010-03-11 | Larry Dwayne Breaux | Ballasted driven pile |
US20110170956A1 (en) * | 2010-01-13 | 2011-07-14 | Vandenbulcke Luc | Method of Providing a Foundation for an Elevated Mass, and Assembly of a Jack-Up Platform and a Framed Template for Carrying Out the Method |
US20110305521A1 (en) * | 2010-06-09 | 2011-12-15 | Wouter Joachim Henstra | Movable brace frame for self-installing platform |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6036404A (en) | 1993-08-31 | 2000-03-14 | Petroleo Brasileiro S.A.-Petrobras | Foundation system for tension leg platforms |
US8215874B2 (en) * | 2009-01-12 | 2012-07-10 | Reeves William W | Modular foundation designs and methods |
EP2402511B1 (en) * | 2010-07-02 | 2016-03-02 | IHC Holland IE B.V. | Template for and method of installing a plurality of foundation elements in an underwater ground formation |
US8939213B2 (en) * | 2012-04-26 | 2015-01-27 | Vetco Gray Inc. | Systems, spacer devices and methods for aligning multi-well modular templates and associated wells |
EP2677086B1 (en) | 2012-06-18 | 2014-12-31 | BAUER Maschinen GmbH | Method for anchoring a structure to a bed of a body of water and underwater foundation |
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US2651181A (en) | 1948-08-20 | 1953-09-08 | Pure Oil Co | Floating telescopic piling template |
US2960832A (en) | 1955-08-26 | 1960-11-22 | Hayward John Thomsen | Submergible barges with anchor spuds |
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EP0177197A1 (en) | 1984-09-07 | 1986-04-09 | Nippon Steel Corporation | Tendon of a tension leg platform and electrical corrosion protecting method of the same |
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DE3314126C2 (en) * | 1983-04-19 | 1985-12-05 | GTE Valeron Corp. (eine Gesellschaft n.d.Ges.d. Staates Delaware), Troy, Mich. | Tool holder |
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1998
- 1998-04-15 US US09/059,999 patent/US6036404A/en not_active Expired - Lifetime
-
1999
- 1999-03-18 US US09/272,165 patent/US6142709A/en not_active Expired - Lifetime
- 1999-11-17 US US09/441,377 patent/US6312195B1/en not_active Expired - Lifetime
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